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//! Write a graphics backend.
use iced_native::image;
use iced_native::svg;
use iced_native::{Font, Size};
/// The graphics backend of a [`Renderer`].
///
/// [`Renderer`]: crate::Renderer
pub trait Backend {
/// Trims the measurements cache.
///
/// This method is currently necessary to properly trim the text cache in
/// `iced_wgpu` and `iced_glow` because of limitations in the text rendering
/// pipeline. It will be removed in the future.
fn trim_measurements(&mut self) {}
}
/// A graphics backend that supports text rendering.
pub trait Text {
/// The icon font of the backend.
const ICON_FONT: Font;
/// The `char` representing a ✔ icon in the [`ICON_FONT`].
///
/// [`ICON_FONT`]: Self::ICON_FONT
const CHECKMARK_ICON: char;
/// The `char` representing a ▼ icon in the built-in [`ICON_FONT`].
///
/// [`ICON_FONT`]: Self::ICON_FONT
const ARROW_DOWN_ICON: char;
/// Returns the default size of text.
fn default_size(&self) -> u16;
/// Measures the text contents with the given size and font,
/// returning the size of a laid out paragraph that fits in the provided
/// bounds.
fn measure(
&self,
contents: &str,
size: f32,
font: Font,
bounds: Size,
) -> (f32, f32);
}
/// A graphics backend that supports image rendering.
pub trait Image {
/// Returns the dimensions of the provided image.
fn dimensions(&self, handle: &image::Handle) -> (u32, u32);
}
/// A graphics backend that supports SVG rendering.
pub trait Svg {
/// Returns the viewport dimensions of the provided SVG.
fn viewport_dimensions(&self, handle: &svg::Handle) -> (u32, u32);
}
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